Android Location Based Services 1.pdf

7/25/2019 Android Location Based Services 1.pdf

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Android - TextureView

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Android - Location Based Services
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Android location APIs make it easy for you to build location-aware applications, without needing to focus on thedetails of the underlying location technology.

This becomes possible with the help of Google Play services, which facilitates adding location awareness to your app wi

automated location tracking, geofencing, and activity recognition.

This tutorial shows you how to use Location Services in your APP to get the current location, get periodic location updates, look

addresses etc.

The Locationobject represents a geographic location which can consist of a latitude, longitude, time stamp, and other informati

such as bearing, altitude and velocity. There are following important methods which you can use with Location object to g

location specific information:

The Location Object
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Sr.No. Method & Description

1 float distanceTo(Location dest)

Returns the approximate distance in meters between this location and the given location.

2 float getAccuracy()

Get the estimated accuracy of this location, in meters.

3 double getAltitude()

Get the altitude if available, in meters above sea level.

4 float getBearing()

Get the bearing, in degrees.

5 double getLatitude()Get the latitude, in degrees.

6 double getLongitude()

Get the longitude, in degrees.

7 float getSpeed()

Get the speed if it is available, in meters/second over ground.

8 boolean hasAccuracy()

True if this location has an accuracy.

9 boolean hasAltitude()

True if this location has an altitude.


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10 boolean hasBearing()

True if this location has a bearing.

11 boolean hasSpeed()

True if this location has a speed.

12 void reset()

Clears the contents of the location.

13 void setAccuracy(float accuracy)

Set the estimated accuracy of this location, meters.

14 void setAltitude(double altitude)

Set the altitude, in meters above sea level.

15 void setBearing(float bearing)

Set the bearing, in degrees.

16 void setLatitude(double latitude)

Set the latitude, in degrees.

17 void setLongitude(double longitude)

Set the longitude, in degrees.

18 void setSpeed(float speed)

Set the speed, in meters/second over ground.


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19 String toString()

Returns a string containing a concise, human-readable description of this object.

To get the current location, create a location client which is LocationClientobject, connect it to Location Services using connec

method, and then call its getLastLocation()method. This method returns the most recent location in the form of Locationobje

that contains latitude and longitude coordinates and other information as explained above. To have location based functionality

your activity, you will have to implement two interfaces

GooglePlayServicesClient.ConnectionCallbacks

GooglePlayServicesClient.OnConnectionFailedListener

These interfaces provide following important callback methods, which you need to implement in your activity class

Sr.No. Callback Methods & Description

1 abstract void onConnected(Bundle connectionHint)

This callback method is called when location service is connected to the location client successfully. You will us

connect()method to connect to the location client.

2 abstract void onDisconnected()

This callback method is called when the client is disconnected. You will use disconnect()method to disconnect frothe location client.

3 abstract void onConnectionFailed(ConnectionResult result)

This callback method is called when there was an error connecting the client to the service.

Get the Current Location


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You should create the location client in onCreate()method of your activity class, then connect it in onStart(), so that Location

Services maintains the current location while your activity is fully visible. You should disconnect the client in onStop()method,

so that when your app is not visible, Location Services is not maintaining the current location. This helps in saving battery

power up-to a large extent.

If you are willing to have location updates, then apart from above mentioned interfaces, you will need to impleme

LocationListenerinterface as well. This interface provide following callback method, which you need to implement in your activi

class

Sr.No. Callback Method & Description

1 abstract void onLocationChanged(Location location)

This callback method is used for receiving notifications from the LocationClient when the location has changed.

The LocationRequestobject is used to request a quality of service (QoS) for location updates from the LocationClient. There a

following useful setter methods which you can use to handle QoS. There are equivalent getter methods available which you c

check in Android official documentation.

Sr.No. Method & Description

1 setExpirationDuration(long millis)

Set the duration of this request, in milliseconds.

2 setExpirationTime(long millis)

Set the request expiration time, in millisecond since boot.

Get the Updated Location

Location Quality of Service


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3 setFastestInterval(long millis)

Explicitly set the fastest interval for location updates, in milliseconds.

4 setInterval(long millis)

Set the desired interval for active location updates, in milliseconds.

5 setNumUpdates(int numUpdates)

Set the number of location updates.

6 setPriority(int priority)

Set the priority of the request.

Now for example, if your application wants high accuracy location it should create a location request with setPriority(int) setPRIORITY_HIGH_ACCURACY and setInterval(long) to 5 seconds. You can also use bigger interval and/or other priorities li

PRIORITY_LOW_POWER for to request "city" level accuracy or PRIORITY_BALANCED_POWER_ACCURACY for "block" lev

accuracy.

Activities should strongly consider removing all location request when entering the background (for example at onPause()), or

at least swap the request to a larger interval and lower quality to save power consumption.

Once you have Location object, you can use Geocoder.getFromLocation() method to get an address for a given latitude a

longitude. This method is synchronous, and may take a long time to do its work, so you should call the method from t

doInBackground()method of an AsyncTaskclass.

The AsyncTaskmust be subclassed to be used and the subclass will override doInBackground(Params...)method to perform

Displaying a Location Address


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task in the background and onPostExecute(Result)method is invoked on the UI thread after the background computation finish

and at the time to display the result. There is one more important method available in AyncTask which is execute(Params

params), this method executes the task with the specified parameters.

Check following example to have better understanding on how we use AynchTask in any Android application to get work done

the background without interfering main task.

Following example shows you in practical how to to use Location Services in your app to get the current location and its equivale

addresses etc.

To experiment with this example, you will need actual Mobile device equipped with latest Android OS, otherwise you will have

to struggle with emulator which may not work.

Before you proceed to have location support in your Android Applications, you need to set-up Google Play Services SDK usi

following simple steps

Steps Description

1 Launch Android Studio IDE

From Android Studio select file >project structure >dependencies > Click on + button to add dependencies

you would get choose library dependencies dialog window

2 Search for com.google.android.gms:play-services:6.5.87or higher version library. its depend on which android version is using

with.

3 Select the google play services and press apply button as shown below image

Example

Install the Google Play Services SDK


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Step Description

1 You will use Android studio IDE to create an Android application and name it as Tutorialspointunder a package

com.example.Tutorialspoint. While creating this project, make sure you Target SDKand Compile Withat the latest version of Android

SDK to use higher levels of APIs.

2 Add Google Play Servicelibrary in your project by following simple steps given below.

3 Modify src/MainActivity.javafile and add required code as shown below to take care of getting current location and its equivalent

address.

4 Modify layout XML file res/layout/activity_main.xmlto add all GUI components which include three buttons and two text views to

show location/address.

5 Modify res/values/strings.xmlto define required constant values

6 ModifyAndroidManifest.xmlas shown below

7 Run the application to launch Android emulator and verify the result of the changes done in the application.

Let's add Google Play Service reference in the project.Click on file > project structure > dependencies >and select + and th

search google play services which will show com.google.android.gms:play-services:6.5.87Click on ok button. it will close the choo

dependencies windows. you must be close project structure by clicking apply button

Create Android Application


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Above image is showing the result of adding google play services to project. after add google play services to project. It should

as follows


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Following is the content of the modified main activity file src/com.example.Tutorialspoint/MainActivity.java.

packagecom.example.Tutorialspoint;

importjava.io.IOException;


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importjava.util.List;

importjava.util.Locale;

importcom.google.android.gms.common.ConnectionResult;

importcom.google.android.gms.common.GooglePlayServicesClient ;

importcom.google.android.gms.location.LocationClient;

importandroid.content.Context;

importandroid.location.Address;

importandroid.location.Geocoder;

importandroid.location.Location;

importandroid.os.AsyncTask;

importandroid.os.Bundle;

importandroid.support.v4.app.FragmentActivity;

importandroid.util.Log;

importandroid.view.View;

importandroid.widget.Button;

importandroid.widget.TextView;

importandroid.widget.Toast;

publicclassMainActivityextendsFragmentActivityimplements

GooglePlayServicesClient .ConnectionCallbacks,

GooglePlayServicesClient .OnConnectionFailedListener

{

LocationClientmLocationClient;

privateTextViewaddressLabel;

privateTextViewlocationLabel;

privateButtongetLocationBtn;

privateButtondisconnectBtn;

privateButtonconnectBtn;

@Override

protectedvoidonCreate(BundlesavedInstanceState){

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

locationLabel =(TextView)findViewById(R.id.locationLabel);

addressLabel =(TextView)findViewById(R.id.addressLabel);

getLocationBtn =(Button)findViewById(R.id.getLocation);


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getLocationBtn.setOnClickListener(newView.OnClickListener(){

publicvoidonClick(Viewview){

displayCurrentLocation ();

}

});

disconnectBtn =(Button)findViewById(R.id.disconnect);

disconnectBtn.setOnClickListener(newView.OnClickListener(){


mLocationClient.disconnect();

locationLabel.setText("Got disconnected....");}

});

connectBtn =(Button)findViewById(R.id.connect);

connectBtn.setOnClickListener(newView.OnClickListener(){


mLocationClient.connect();

locationLabel.setText("Got connected....");

}

});

// Create the LocationRequest objectmLocationClient =newLocationClient(this,this,this);

}

@Override

protectedvoidonStart(){

super.onStart();

// Connect the client.

mLocationClient.connect();

locationLabel.setText("Got connected....");

}

@Override

protectedvoidonStop(){

// Disconnect the client.

mLocationClient.disconnect();

super.onStop();

locationLabel.setText("Got disconnected....");

}

@Override


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publicvoidonConnected(BundledataBundle){

// Display the connection status

Toast.makeText(this,"Connected",Toast.LENGTH_SHORT).show();

}

@Override

publicvoidonDisconnected(){

// Display the connection status

Toast.makeText(this,"Disconnected. Please re-connect.",Toast.LENGTH_SHORT).show();

}

@Override

publicvoidonConnectionFailed(ConnectionResultconnectionResult){

// Display the error code on failure

Toast.makeText(this,"Connection Failure : "+connectionResult.getErrorCode(),Toast.LENGTH_SHORT).show();

}

publicvoid displayCurrentLocation(){

// Get the current location's latitude & longitude

LocationcurrentLocation =mLocationClient.getLastLocation();

Stringmsg ="Current Location: "+

Double.toString(currentLocation.getLatitude())+","+

Double.toString(currentLocation.getLongitude());

// Display the current location in the UI

locationLabel.setText(msg);

// To display the current address in the UI

(newGetAddressTask(this)).execute(currentLocation);

}

/*

* Following is a subclass of AsyncTask which has been used to get

* address corresponding to the given latitude & longitude.

*/

privateclassGetAddressTaskextendsAsyncTask{ContextmContext;

publicGetAddressTask(Contextcontext){

super();

mContext =context;

}

/*

* When the task finishes, onPostExecute() displays the address.

*/


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@Override

protectedvoidonPostExecute(Stringaddress){

// Display the current address in the UI

addressLabel.setText(address);

}

@Override

protectedStringdoInBackground(Location...params){

Geocodergeocoder =newGeocoder(mContext,Locale.getDefault());

// Get the current location from the input parameter listLocationloc =params[0];

// Create a list to contain the result address

addresses =null;

try{

addresses =geocoder.getFromLocation(loc.getLatitude(),loc.getLongitude(),1);

}

catch(IOExceptione1){

Log.e("LocationSampleActivity" ,IO ExceptioningetFromLocation());

e1.printStackTrace();

return("IO Exception trying to get address");}

catch(IllegalArgumentException e2){

// Error message to post in the log

StringerrorString ="Illegal arguments "+

Double.toString(loc.getLatitude())+" , "+Double.toString(loc.getLongitude())+" passed to address service"

Log.e("LocationSampleActivity" ,errorString);

e2.printStackTrace();

returnerrorString;

}

// If the reverse geocode returned an address

if(addresses !=null&&addresses.size()>0){// Get the first address

Addressaddress =addresses.get(0);

/*

* Format the first line of address (if available),

* city, and country name.

*/

StringaddressText =String.format("%s, %s, %s");


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// If there's a street address, add it

address.getMaxAddressLineIndex ()>0?

address.getAddressLine(0):"",

// Locality is usually a city

address.getLocality(),

// The country of the address

address.getCountryName());

// Return the textreturnaddressText;

}

else{

return"No address found";

}

}

}// AsyncTask class

}

Following will be the content of res/layout/activity_main.xmlfile


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android:layout_alignEnd ="@+id/imageButton" >

< LinearLayout>

Following will be the content of res/values/strings.xmlto define two new constants:

Tutorialspoint< string>

Settings< string>

Hello world!< string>

" l i " G L i


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Get Location< string>

Disconnect Service< string>

Connect Service< string>

< resources>

Following is the default content of AndroidManifest.xml

< intent filter>

< activity>

< application>

< manifest>

Let's try to run your Tutorialspointapplication. I assume that, you have connected your actual Android Mobile device with yocomputer. To run the app from Android Studio, open one of your project's activity files and click Run icon from the toolb

Before starting your application, Android studio installer will display following window to select an option where you want to r

your Android application.


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Now to see location select Get Location Button which will display location information as follows


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Previous Page Next Page

You can try by disconnecting location client using Disconnect Serviceand then connecting it by using Connect Servicebutton. Y

can also modify to get location update as explained above and in Android Official documentation.

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Android Location Based Services 1.pdf